<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
</head>

<body>
    <div class="app-container" id="app">
        <!-- 顶部banner -->
        <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
        <!-- 面包屑 -->
        <div class="breadcrumb">
            <span>🏠</span> /
            <span>购物车</span>
        </div>
        <!-- 购物车主体 -->
        <div class="main" v-if="fruitList.length">
            <div class="table">
                <!-- 头部 -->
                <div class="thead">
                    <div class="tr">
                        <div class="th">选中</div>
                        <div class="th th-pic">图片</div>
                        <div class="th">单价</div>
                        <div class="th num-th">个数</div>
                        <div class="th">小计</div>
                        <div class="th">操作</div>
                    </div>
                </div>
                <!-- 身体 -->
                <div class="tbody">

                    <div class="tr" v-for="item in fruitList" :key="item.id" :class="{active:item.isChecked}">
                        <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
                        <div class="td"><img :src="item.icon" alt="" /></div>
                        <div class="td">{{item.price}}</div>
                        <div class="td">
                            <div class="my-input-number">
                                <button class="decrease" :disabled="item.num<=1" @click="item.num--"> - </button>
                                <span class="my-input__inner">{{item.num}}</span>
                                <button class="increase" @click="item.num++"> + </button>
                            </div>
                        </div>
                        <div class="td">{{item.price*item.num}}</div>
                        <div class="td"><button @click="del(item.id)">删除</button></div>
                    </div>
                </div>
            </div>
            <!-- 底部 -->
            <div class="bottom">
                <!-- 全选 -->
                <label class="check-all">
            <input type="checkbox" v-model="isAll"/>
            全选
          </label>
                <div class="right-box">
                    <!-- 所有商品总价 -->
                    <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
                    <!-- 结算按钮 -->
                    <button class="pay">结算({{totalNum}} )</button>
                </div>
            </div>
        </div>
        <!-- 空车 -->
        <div class="empty" v-else>🛒空空如也</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                // 水果列表
                fruitList: localStorage.getItem('list')
                    //  [{
                    //     id: 1,
                    //     icon: 'http://autumnfish.cn/static/火龙果.png',
                    //     isChecked: true,
                    //     num: 2,
                    //     price: 6,
                    // }, {
                    //     id: 2,
                    //     icon: 'http://autumnfish.cn/static/荔枝.png',
                    //     isChecked: false,
                    //     num: 7,
                    //     price: 20,
                    // }, {
                    //     id: 3,
                    //     icon: 'http://autumnfish.cn/static/榴莲.png',
                    //     isChecked: false,
                    //     num: 3,
                    //     price: 40,
                    // }, {
                    //     id: 4,
                    //     icon: 'http://autumnfish.cn/static/鸭梨.png',
                    //     isChecked: true,
                    //     num: 10,
                    //     price: 3,
                    // }, {
                    //     id: 5,
                    //     icon: 'http://autumnfish.cn/static/樱桃.png',
                    //     isChecked: false,
                    //     num: 20,
                    //     price: 34,
                    // }, ],

            },
            methods: {
                del(id) {
                    this.fruitList = this.fruitList.filter(item => item.id !== id)
                }
            },
            computed: {
                isAll: {
                    get() {
                        // 统计所有小选框的状态，都是true到时候返回true，只要有一个false就返回false
                        return this.fruitList.every(item => item.isChecked)
                    },
                    set(flag) {
                        // isALL被修改时自动执行
                        // 让小选框的状态随全选框改变
                        this.fruitList.forEach(item => {
                            item.isChecked = flag
                            console.log(flag);
                        });
                    }
                },
                totalPrice() {
                    return this.fruitList.reduce((sum, item) => {
                        return item.isChecked ? sum + item.price * item.num : sum
                    }, 0)
                },
                totalNum() {
                    return this.fruitList.reduce((sum, item) => {
                        return item.isChecked ? sum + item.num : sum
                    }, 0)
                },
            },
            watch: {
                fruitList: {
                    deep: true,
                    handler() {
                        localStorage.setItem("list", JSON.stringify(this.fruitList))
                    }
                }
            }
        })
    </script>
</body>

</html>